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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e721c99adef807cfbfb1b71c6817d2945bc89b13871f7f8dbc173ef75608df' 
  AND token = 'FWJhuEmFscoBnKDLzS51aR2xFp6xJCFQjnqlQTuN+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}